The Manchester United stalwart gave a virtuoso display against Olympiakos after nearly two months out leading his former team-mate to question why he hadn't been playing more
The 40-year-old, who is now a player-coach at Old Trafford, played a direct part in the first two goals as United overturned a two-goal deficit to reach the Champions League quarter-finals.
Moyes admitted after the game that he has been "trying to look to the future" when selecting younger players and Neville hinted that increased involvement of Giggs could aid the struggling side.
"I don't know why [Moyes] hasn't played [Giggs]. It's strange he hasn't played him for two or three months," he said while a pundit on Sky Sports.
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"[Against Olympiakos] he's needed big performances and he got them from Giggs, [David] de Gea and [Danny] Welbeck."
Wednesday's win over Olympiakos was Giggs' 961st game for United and his 20th of the season.